add invalid __type check

spec/ParseObject.spec.js

@@ -336,6 +336,11 @@ describe('Parse.Object testing', () => {
     item.save({ "foo^bar": "baz" }).then(fail, done);
   });
   
+  it("invalid __type", function(done) {
+    var item = new Parse.Object("Item");    
+    item.save({ "foo": {__type: "IvalidName"} }).then(fail, done);
+  });
+
   it("simple field deletion", function(done) {
     var simple = new Parse.Object("SimpleObject");
     simple.save({

src/Schema.js

@@ -731,19 +731,31 @@ function getObjectType(obj) {
   if (obj instanceof Array) {
     return 'array';
   }
-  if (obj.__type === 'Pointer' && obj.className) {
-    return '*' + obj.className;
-  }
-  if (obj.__type === 'File' && obj.name) {
-    return 'file';
-  }
-  if (obj.__type === 'Date' && obj.iso) {
-    return 'date';
-  }
-  if (obj.__type == 'GeoPoint' &&
-      obj.latitude != null &&
-      obj.longitude != null) {
-    return 'geopoint';
+  if (obj.__type){
+    switch(obj.__type) {
+      case 'Pointer' :
+        if(obj.className) {
+          return '*' + obj.className;
+        }
+        break;
+      case 'File' :
+        if(obj.url && obj.name) {
+          return 'file';
+        }
+        break;
+      case 'Date' :
+        if(obj.iso) {
+          return 'date';
+        }
+        break;
+      case 'GeoPoint' :
+        if(obj.latitude != null && obj.longitude != null) {
+          return 'geopoint';
+        }
+        break;
+      default :
+        throw new Parse.Error(Parse.Error.INCORRECT_TYPE, 'invalid type: ' + obj.__type);
+    }
   }
   if (obj['$ne']) {
     return getObjectType(obj['$ne']);